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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '265f785296f4ba6775816de7a11437d5142cfb93a6a37157e7be4eae12d11991' 
  AND token = 'TyIC07U5C6Spn6rDgjDV+9qHHNiUwtbcfNsZaVy6gms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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