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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98796f977666f10248927683b1ad21392f053bd3be874a9be92bfa13a544d48f' 
  AND token = 'mN489jYE8h/FVeJx2S1V3i+a9XLZ6vnyO/i6e9EmEHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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