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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '895519a99a68da6e19e4a05409773253252987b546552399ba8e8e378fbe6f05' 
  AND token = 'vOgZvon2jlOFx2Da81taoscMxjV7HKrWoi0N6UA+Cpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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