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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '123b81968d371aad00e751670604761b6dfdf54165173aab9f32d3de4cd91542' 
  AND token = 'HQpByhsk80Q8qik28w4JyYPqLuezEyv/WxHyiq7ASzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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