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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaa5cf4236415c79dc5484ca2e7207edc841ea5bebfefd8c6b30737495cee88d' 
  AND token = '31jT5za5X6A/m8G9GNGp+EFHKQ5olAL3vh8lAdZqrPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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