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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ccebcb98a0f84e0e81a18e37428335f3101c8376fc169fdc1eb5f0acf443924' 
  AND token = 'dx0lC1A9zjPmwxEROMnoAvZD/Ujrpj7Uat0kqkRz5zs=' 
  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"
    }
  }
}