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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54543d7753ec62f43ba331992f9ceae138f9861b76f29e217e07f5811060bd86' 
  AND token = 'EKdZdT7VNX1VSZQrptWiYZFWEo/N+MrE8uiKXuDkdw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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