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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7da04e8d7b4d3063fda1baf3f26d412d688ffd9b061036dafa073311959f8a31' 
  AND token = 'mYeQPfZAtVCkhsYSIN7Mfv0m8ZP3dNjEBUm2bgYUkk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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