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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '630291af1d9eff81c6f8566a5bfa5ac19dbcccc2628e52b4227a1bf10057edc9' 
  AND token = 'KxmjZugb6EP+v83mj0wPc08V2vcJMpKa1pdJMD08lQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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