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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f31b89601a9f1d62f693a3c70e5f281c49bc0d5ca79e5c8bed39f10cd59eca19' 
  AND token = 'pptcaDTORrI/ASFP+X41sKyYdLIZ9KPQMsay/Yt8x3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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