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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36c0a5612e7aa7ea1952b70783575c301d757773b7ca1e6b1197cfbe5fb95c05' 
  AND token = 'CIio79Kay6uMT5nvB1Ydns3ebH2DN08C51W+P5aJrXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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