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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4cc3366c207c4f2efe76b6d2c2774b30200761ade6175ab5bc0b9e389147196' 
  AND token = 'vVQzDye3o0fvCtakdv2okQWWG/u8eTA8vsG4BWXQaf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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