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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a332a1e375df6b61c49e2ed8e658a57cfd49cc55dc026f77739258475c72887' 
  AND token = 'nCqRpjXA1Gf+OSk40CIQrUoKC2F1sbE+bIwef6TDUUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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