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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '405d692ad2ff2a3c89c0fcc2de406a64003029720544f6e67cf692643b080136' 
  AND token = 'bX2Fd2Tjm6+w9aiD+I+ZhBjBhk7AL3iRV2KpyCssFJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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