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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdd9ee825cadd7d22039a64262cea371ab6bb47d5050bd606f6090eb20ab27eb' 
  AND token = 'lqtEa0FN4zCl5avFVI6drF6bZh7n9F6T/V2OVnRP87U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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