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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65550de3fa2ba0df14d770c2d84615e2c7be7bf78b177f730da52cc388e2479e' 
  AND token = 'X/XiBDtWugOdTCxKrj0L8U2JT4SHI60D4Sl+JtXeFec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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