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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '433e0c06bb2cae1e5dfa256037207538d2747ac8531bcbc9e9b7b17b53dc66a8' 
  AND token = '1XD6JUIlp2oKpQgPRKOEmKJRik8YO63SSKAdcEPksQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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