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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7053aa6f7b1287d7c59204b001ee9cb8edabbfaa785c80b5c05c4a3cff7cc1fa' 
  AND token = 'U4+cdisPw06/yZ71+OP1HpM5d7xAd0pZvYxTHt7XuWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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