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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d94b105f2e51dd712d711db301b677df1f6b96ff525af6666af1a9a2548d5a3' 
  AND token = 'r8n1gr/ceV8W3zx23TzY0O3jwbT1WYrQMM0fSqbOeWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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