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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee9d775ea2cf3c305db44c8c91574d72830a1505972fef9f6914c38e5ea7e2fe' 
  AND token = 'vQSI43B7UsZtNfyezClADUPMwZoiCn6vq260qDVjtcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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