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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bd5fadf8b23f79377afa3b61e0aa5d73d88840fecb420cac2bfeb9e43b9e82a' 
  AND token = 'GqcKxukd1BGGGd98psNR9EfN6yeROV4CgoOCW5w5r44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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