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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12d0a04662c63dd22c8f01c8e73fcdb175e4ce70bc4c4f3993c4da3b78cd431d' 
  AND token = 'dSJD7HEKFSfvNyUCqTQYBYJWbh/n4asZZva9F6cVK98=' 
  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"
    }
  }
}