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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0979ec1dc53ab58119f46c6e721f91b043af39516348187cc5a34dcf05c0b45f' 
  AND token = 'xq2gx3kG4lG2wVFn7eV0ol4icI3mLOh329uem5ztmx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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