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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cc976c9f5ecf81083d7c1d82239911f3de1f12d3854ee97268576c105e84956' 
  AND token = 'a3D5PV4V5jOHtOeFwmLpdP6N2hC1nc2fTsTMrYpp4rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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