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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da3626687edd8c2965ffc4363ebbcb1f463e2a0f25d88c57c3040db3d4c5878c' 
  AND token = 'yxt/LPljJX3amZ9Lt1aE1Y4SFo+ODPViv2HH2EwWKas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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