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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '996e8c88f148671d3d062c4b7ced7a6cda8e88aec584cbac5430c4dcb55f1795' 
  AND token = '5U3q6yaj0hF6nVKxIxcOjqm8a/MH5dXR08IIY94J7hE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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