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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e18660c420fa2ed6b94e2788da00398ecb3ab32e121f242a0a6548486e7926e7' 
  AND token = 'Z9B76/NjDG9iL4bme2WF/Y7o/I4A0D9IBKnKDMpRJmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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