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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e83bf6e14d69dba9c4ac1a001daab67f9165b4baed2f66c0cd77f01ed5f4bc3' 
  AND token = '+xn75s/eL893cOz835P1tX96g3waf4HnHZ6G4k/OgUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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