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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f11a00b28527ef0b5b6c560e8a26d1706290defd48d1d5c3826d09b9c51dcbf9' 
  AND token = 'V7i4HsKEQkzlczHhoZUs9z4kEfVZd4fk9edzDP1qdnk=' 
  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"
    }
  }
}