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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b2e27e3371a398de80cf5e1a7e01ffca4177fc033a1f713ed078d3b6a264ceb' 
  AND token = 'q41zL6wfMzrn3Lxmco2IAVpgDc55ZyN31zfc9BHuV90=' 
  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"
    }
  }
}