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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c5fe58f955551b75418dc5532a17db7022fb3dfd6f18a259a7ff9db8a19d2fe' 
  AND token = 'xm0OqE8UszxU48gnPP/HZjkhKTEXTM6phy0R4912Yi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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