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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d5573c9d64cb5cf5d2779d347c92307e355d310787806a74c3662960bcea4a3' 
  AND token = '8ad4CMt5mSGqncNrqHr3TsakkS4ag0SYbgE7z/hdDqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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