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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af89d92e03288f6ebebe2b8b3196c4d3a77c965e9c9c6669a29038e8b8ad69c6' 
  AND token = '4C92mDqWOAxBI+4OEBc0MwMSr5ii5d3OrKrxIvvtOuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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