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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3d7e5141878c671e4903dbe45848b608804d8b8fa0babf8f7aa46b82e7ea5e5' 
  AND token = '/vpaS2eyfLcL1p4Ska3M9rx22gAwM5pkZsOMiWnBNpQ=' 
  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"
    }
  }
}