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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fc4241a458c10918e5342e1f85eceb3bea979538e24c3f4c89af1a24e5643be' 
  AND token = 'hzNzmQ4v89QN26+DGndk8NnyyJQqZei+H+DPPhTS9vQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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