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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5eea8a8876aeef700096a94e4cfc8013f1f5e4ab7d61b3d21e989ee9635e8222' 
  AND token = 'wUq5C2PCPVxo4Fy3LZ3iwvbTrvmy6EHe5XAv9bVg89Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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