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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f0b2e4c5e7092f33d3ecabf10a37ee0e4f7695d3af764fdb50bed611bbab6ac' 
  AND token = 'g4UNA8R6Ed8naOjHXxosKtsqi2OdxraO5AnecCbUD1c=' 
  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"
    }
  }
}