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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1323e63e7966bd6cbbcef99a7550c10c8d2c5213e6b116a01aa80c1ce1dfe7d4' 
  AND token = 'edItrgvji5YqRAiDX3jI7ew0qcQ9EbUUqq7E2y51NR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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