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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a1138a9d8d806b6acad7a10f645e57210305d29192c7d3110de68fe019c098e' 
  AND token = 'eeZ14+wUlHlDEQsIslk7OslAlZ5hZjq+fGLrQ+cm0dc=' 
  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"
    }
  }
}