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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1dec2e50b67978f79da10185e927f2ee510f38e8cbc4c5202e9a4aa90962957' 
  AND token = '0jSkyGgrk3SmJtsG3CAYAEtF9f6q/V49Hi4yT7XwAJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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