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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2feb9bd9dd4b014882796fcc32786d414e7214d1aec2c79eac8eb3daf43b1ecc' 
  AND token = 'CS6QlPLtwB740/DTrc4nyajo1rK+/yNAADLF7E+WZak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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