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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34c4f2547d4836ecf26d02b398efe904b21f8be9394c412d6ec41e92b73855d7' 
  AND token = 'RUf7b3UaeRy1l7cgnY2d3gzgTXS8GSYcqCAtbgYUu/M=' 
  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"
    }
  }
}