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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bc150cc13de23af14a1c4a6feeef3b53eee1a88c6cc793f988f7c02f5505fc1' 
  AND token = 'HvwuyuS/D17PybnwLvmGrDlvnThknyjW2d07IewD4XQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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