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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36f6b9bd668a756cb0394ed2e7c2942470c0bea7ff4e7e7a7ec09b35ad1e20e9' 
  AND token = 'VGbvCilGu6yuiVajTM30jPNH/MxlvaAH2lIuGJqyKEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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