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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97c51bb5a63d0de4f49ca07647d98f4c6a864726e6992dd7aeb4a716f26cddb2' 
  AND token = 'AbiVW7m8HHlsUccBf/c72mmT/K/TsAe5rJ9ES8gpqZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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