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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b98bf0f9fecbf82a61286796fbc9ddbd5af7e2e8856a48f83518b0b710c541ab' 
  AND token = 'tXQjXbCBzhHYhNlZBCL9sNM2bpooqHY2wLvh63j2U88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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