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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d6bd41a335cad9b4b7c9d2f92696aeb65aea40347b9350f5e4405e1b6afe972' 
  AND token = 'FDTQA1hjGLOjXDRidtnSWPTafP/KtBwCsZ5NPid/QXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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