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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8450e3cdc7a1f90a1768117180d7f69ae9d62d05a32c163193c10534a52b0923' 
  AND token = 'YobhI5gM/NVW0anY2OFvXh8USLnvRzNkdFUEeDqxrkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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