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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0e8372c5858db3de824d2eaab74656aba4610ff87d8f78410c6b2cf1bc25cd4' 
  AND token = '7uNd1uQ7UQDzh6YXHbR1lypxMcA4z6sztzGI7I2RQfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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