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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a8c2d60377c3f0886eeac659a3ec1e7da00c5624cdb0c2de3e3388d9d17524b' 
  AND token = 'tYX1Y56L5ID8iKRffuv2KfKR1gXvKTzNf5BKYVC/Vi0=' 
  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"
    }
  }
}