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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4813ca54bc572d1dc279bd2fd65e80e8fbb693c7bec7d80fd794c25be727e216' 
  AND token = 'ILb+jVi43Ga63jy3HS1RnZvHg6QPLX5LAU5vQDUh6eI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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