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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e85316c4faafa031e55f98b0d1097b7770be9e27f9727b6dc6e6ca1f399bb3b' 
  AND token = 'N2iiWZdl8A/z0EUMED9bXVXP7GEoqFKZzHo2Fnb8/B4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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