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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9130ed14c4a8801aeec6df4e258378cae601a54efac3fc5824b03870d6d08010' 
  AND token = 'hF9J8n4zZp6dGjJVVPEV2Ndwm3oLK9C+b2vhEEvd31U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}