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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd80e47970c24f240439352d6314701551cbbfa97b7776243b0ba9807256e27dd' 
  AND token = '29gEjB/pU7vtE7eWa1Tw9Pl6WlnGo9C1p7WHl2fztBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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