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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52adf9bbcfd4d55b5a9574ca4a3c8bd46678d02d1487cf535a1357883151d9f4' 
  AND token = '3dHnXP5mL1s4aLqPW3mQG29qWSwxmNCwXcHzuBc1sq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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