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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f9928ff924f2b83161b0999c95f03e9417317035c1ffbe4fb11a1b94a5be360' 
  AND token = 'ye1u7hODGDZK237oinLa66J4TDRb6N1riHTOcS2z3sI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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