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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8c208e6aa8982f74719ecd1ba854cba373df78a650fcca4dcae8be6c83d8809' 
  AND token = '3CL9ftaAiD9/lpyzWru3d9GPrVylHVWw7pNlCilXmtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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