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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa95cc90afe2b5a9b71666b8ee7623883f9d9beab5e9d4681d9575afc4e0f9b2' 
  AND token = 'MF5B+ISY99N0MrSL931kxCwErNh4qXxnTQ+VY81l7Bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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