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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bffe2a265e68ec2dff2b9a5c8b7c7954ef9066759176e9b56a4221c557fd9690' 
  AND token = '/asYrsDr7wjZX9O6Mf23TE0srbivz5xXnWl9TBunMkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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