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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a38ed8db608ea1910ca27ce4ba0f7629caa6ae7c85874c6e38cc67956f8a576' 
  AND token = 'wEU6T1NQY+jVi8M/31n2weQNG5yt1AV5WAH4qg5J3xo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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