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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d5a0e6e08ad1408eb60f3b7c573754487bde6f239edc228b14f92b43e94c299' 
  AND token = 'mcZpiaPo0KlnYeuoKjAiiJrRd/6KZF8q7h8rI1uYjY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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