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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efef1e19fa0dabe84c7a3b2c45e8c0e7df9105e4971a42757b094979c699f7e9' 
  AND token = 'zZC/1MIhLlV/QnAIjZ+D6A5AqvbUr7gIzylOoMBozBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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